多項(xiàng)選擇題You are the network administrator of a medium-sized company, and users are complaining that they cannotsend emails to some organizations. During your troubleshooting, you notice that your DNS MX record isblacklisted by several public blacklist filters. After clearing these listings for your IP address, and assumingthat your email server has the right virus protection in place, what are two possible solutions to prevent thisfrom happening in the future?()

A.Change your Internet provider.
B.Change your public IP address.
C.Allow the email server to send traffic only to TCP port 25.
D.Put your email server in a DMZ.
E.Use a separate public IP address for your email server only.


您可能感興趣的試卷

你可能感興趣的試題

1.單項(xiàng)選擇題While deploying a new switch, you accidently connect ports 3/12 and 3/18 together, creating a loop. STP detected it and placed port 3/18 in blocking mode. Why did STP not place port 3/12 in blocking mode instead? ()

A. Port 3/12 was already up and forwarding before the loop was created.
B. Port priority is based on lowest priority and lowest port number.
C. You connected the wire on port 3/18 last.
D. None of the above, it is purely random.

2.單項(xiàng)選擇題After applying a new ACL on a device, its CPU utilization rose significantly and many messages startingwith "%SEC-6-IPACCESSLOG" appeared on the Syslog server.What can be done to resolve this situation?()

A.Increase memory allocation for ACLs.
B.Remove all entries from the ACL and use a single permit ip any any statement.
C.Remove the log keyword from each ACL entry.
D.Reboot the device after the ACL has been applied.

4.單項(xiàng)選擇題Which feature would prevent guest users from gaining network access by unplugging an IP phone andconnecting a laptop computer?()

A.IPSec VPN
B.SSL VPN
C.port security
D.port security with statically configured MAC addresses
E.private VLANs

5.多項(xiàng)選擇題Refer to the exhibit. There are two sites connected across WAN links. All intersite and intrasite links always have the same routing metric. The network administrator sees only the top routers and links being used by hosts at both LAN A and LAN B. What would be two suggestions to load-balance the traffic across both WAN links?()

A. Make HSRP track interfaces between the edge and core routers.
B. Replace HSRP with GLBP.  用GLBP替換HSRP
C. Add crossed intrasite links: R1-R4, R2-R3, R5-R8, and R6-R7.
D. Make R3 and R8 have lower HSRP priority than R1 and R7.
E. Replace HSRP with VRRP

7.單項(xiàng)選擇題Customer X has a hub-and-spoke Frame Relay network, with a central office and two branch offices (RemoteA and RemoteB). Each location has only one physical link to the Frame Relay cloud and RemoteB has a router that is not a Cisco router. Since the installation, there is no connectivity between RemoteB and the central office. What is a possible solution to this issue? ()

A. Because Frame Relay IETF encapsulation is only configurable at interface level, you must use IETF encapsulation on all routers.
B. This is not a possible scenario. A dedicated Frame Relay link to RemoteB is mandatory at the central office.
C. The router at RemoteB must be replaced by a Cisco router.
D. Use Frame Relay IETF encapsulation on a per-VC basis on the central office router.
E. There is a problem in the Frame Relay cloud, because Cisco routers are compatible with IETF Frame Relay.

8.單項(xiàng)選擇題For a router connected to two ISPs for redundancy, using IPSLA and static routing, how would youconfigure uRPF on the uplink interface?()

A.ip verify unicast source reachable-via any
B.ip verify unicast reverse-path
C.ip verify unicast reverse-path loose
D.ip verify unicast reverse-path strict

9.單項(xiàng)選擇題Before inserting a new switch in the network, the network administrator checks that the VTP domain name is correct, the VTP mode is set to server, and revision is lower than the switches in the network. The administrator then configures interfaces and trunks, erases existing VLANs, and connects the switch to the network. Following that procedure, there is no connectivity in the network. What is a possible cause of this problem? ()

A. Because the configuration revision of the new switches is lower than the rest of the network,it can change the VLAN database of the other switches.
B. As a VTP server, the new switch deleted all VLANs of the network.
C. Erasing VLANs increases the VTP configuration revision.
D. Since the configuration revision of the network is higher than the new switch,the VLAN database was automatically synchronized.

10.多項(xiàng)選擇題

Refer to the exhibit. Users from the Engineering VLAN complain that every time Business VLAN users have a network connectivity issue, the Engineering VLAN users usually have problems experiencing slow response or network connectivity problems. After troubleshooting, an unauthorized switch 2 was found. This unauthorized switch has been a regular problem, assuming the root bridge function under the spanning-tree domain and causing the 
Engineering VLAN to be unstable. Which three of these actions could be suggested to fix the problem?()

A. Upgrade Spanning Tree Protocol to Rapid Spanning Tree Protocol.
B. Change Business VLAN PCs to switch 1 and switch 4.
C. Force the root bridge to be switch 2, instead.
D. Adjust spanning-tree timers (max-age and forward-delay).
E. Shut down all unused ports.
F. Use MSTP to separate the Engineering VLAN from the Business VLAN to optimize spanning-tree convergence time within each VLAN

最新試題

In order to configure two routers as anycast RPs, which of these requirements, af a minimum, must besatisfied?()

題型:單項(xiàng)選擇題

On the basis of the network provided in the exhibit, all routers are configured to run EIGRP on all links. If the link between PG-R1 and PG-R2 fails, what is the maximum number of queries PG-R3 will receive for 192.168.1.0/24, assuming that all the packets sent during convergence are transmitted once (there are no dropped or retransmitted packets)?()

題型:單項(xiàng)選擇題

Spanning Tree Protocol IEEE 802.1 s defines the ability to deploy which of these?()

題型:單項(xiàng)選擇題

Which two of these are used in the selection of a root bridge in a network utilizing Spanning Tree ProtocolIEEE 802.1 D?()

題型:多項(xiàng)選擇題

Choose two commands that are required to enable multicast on a router, when it is known that thereceivers use a specific functionality of IGMPv3.()

題型:多項(xiàng)選擇題

What is the correct command to set the router ID for an OSPFv3 process?()

題型:單項(xiàng)選擇題

In GLBP,which router will answer on client ARP requests?()

題型:單項(xiàng)選擇題

What is the command to configure RSVP to reserve up to one-tenth of a Gigabit link,but only allow eachindividual flow to use 1 MB/s?()

題型:單項(xiàng)選擇題

Based on the exhibit presented. What will be the objective of this route map when applied to traffic passing through a router?()

題型:單項(xiàng)選擇題

Two routers configured to run BGP have been connected to a firewall, one on the inside interface and one on the outside interface. BGP has been configured so the two routers should peer, including the correctBGP session endpoint addresses and the correct BGP session hop-count limit EBGP multihop. What is agood first test to see if BGP will work across the firewall?()

題型:單項(xiàng)選擇題